TOA Electronics W-906A User's Manual
Contents
1. Clamps off lead wires from module inputs mute terminals and bridging input output terminals 4 INSTALLATION AND CONNECTION Installing this amplifier requires the optional back box which is Model BX 9F for flush mounting in any 4 inch wall and Model BX 9S for surface mounting Fix the back box first in installing the amplifier Installing Procedure Step 1 Attach hinges to the back box by means of screws The hinges and screws are accessories supplied free of change Step 2 Fix the amplifier to the back box by inserting the amplifier bolts into the hinges as illustrated Ko o o o o HINGE M3 x 6 mm 6 pcs Amplifier Back Box main chassis BX 9F BX 9S From indoor wiring Step 3 Connecting power cable wee BLACK Be sure to make proper cable connections according to color cording of the power cable After connection is completed insulate sufficiently the jointed sections and put them in a junction box WHITE WHITE BLACK Step 4 Attaching the junction box to the back box The BX 9F differs from the BX 9S in the way to attach the junction box to the back box BX 9F BX 9S amp M8 x 10 screw 4 pcs M3 x 8 Tapping screw 4 pcs SPEAKER TERMINAL Step 5 Connecting the speaker cable Connect the speaker cable to the speaker terminals on the junction box Ampli2. Unite these cables to allow free rotation of the amplifier Note Use modules with suffix S for standard input port Input Expander The optional expanding kit WE 2 is necessary to increase the number of input Up to two inputs may be added by loading the expanding kit in the user s space For details refer to the instruction manual of the kit A CAUTION Installation of optional items should be performed by a qualified service personnel Expanding kit WE 2 Modules Note When the temperature of heat sink exceeds 105 C the protection circuit is activated and the output is disconnected from the circuit The signal automatically begins to be output as the temperature goes down In such a case confirm whether or not unit is overloaded or operated on an excessive output 5 SERVICING Unpacking Upon receipt of the amplifier shipment please incurred for any damage incurred in transit If damage is found please notify your local TOA representative and the transportation company immediately State date nature of damage whether any damage was noticed on the shipping container prior to unpacking Please give waybill number of shipping order Failure Should amplifier fail contact your nearest TOA authorized contractor or service center 6 OPERATING When all connections are completed turn power switch on Then the power indicator is illuminated Approx 5 seconds after switching power on the amplifier comes int
3. Flush mounting in wall back box BX 9F Surface mounting on wall back box BX 9S Flange nut oniinn Tapping Screw 3 X 8 secese INCH SChOW aranes aria net Indication label eee Instruction manual W 906A 912A Instruction manual New 900 series modules 1 Expanding kit WE 2 Volume control cover black YA 910 TOA Corporation 133 02 738 9B
4. Indicators 1 LED power indicator 1LED peak indicator Protection Self protection with 2 AC fuses 1 inside and 1 output fuse Connectors Input 1 to 6 Card edge connector Output Screw terminal strip Bridging input output Screw terminal strip Mute Screw terminal strip AC Power cord SJT 3 conductor Power Consumption AC120 V 60 Hz 100 W AC120 V 60 Hz 180 W Color Silver Dimensions Face panel 412 w x 680 h x 28 d mm BX 9F Back Box 362 w x 628 h x 98 d mm BX 9S Back Box 412 w x 680 h x 98 d mm Weight 13 7 kg 17 3 kg without input modules and back box without input modules and back box Other Features Output disconnect for approx 5 sec after power turned on Muting Function Accomplished by input module X 11S B 11S and E 11S Frequency Response Power Bandwidth and Frequency Response are from input port to power amplifier output Note The design and specifications are subject to change without notice for improvement 11 Accessories Volume control COVED rrrererrnnnnnnovrnnrnnnnnnvnnnnnnnnre Key for door irrnnrnnrnnnnnvvnnnnrnnnrnrennnnrnnrnnrnnnrnnnnnr Lift off hinge receptacle mrrrnrnnnnnrnnnnnrnnnnnnnnn Machine screw M4 x 10 rrrerrerorerrrnnnrrorrnrrnnnnnneeer Machine Screw M3 X 6 mmmrrerrererrrrrnnnrrrrrnrrnnnnenerer Machine screw M3 x 10 rrrrrrerorenrnnnnrrrrrnnrnnnnnnseer e Optional products
5. 1k 2k 4k 8k 16k AN AAAADA SVGoaeses Power switch Applies line power Two position push button switch for on off modes Input volume controls Adjust gain of input 1 6 respectively Master volume controls Adjust overall gain of unit Modules optional Select appropriate modules according to the application Compressor control limiter Setting the control switch to OFF position bypasses the compressor circuit and turning it clockwise will reduce the limiter level will limit the output Equalizer switch Place this switch in the IN position to activate an equalizer High pass filter switch Place this switch in the ON position to cut off unnecessary low frequency Low pass filter switch Place this switch in the ON position to cut off unnecessary high frequency Equalizer controls 9 band filters 12 dB boots and cut at each center frequency 10 11 12 13 14 15 16 Equalizer Section Power indicator Comes on when power is switched on Peak indicator Comes on when the output signal reaches the rated output power level Output fuse Prevents excessive current flow W 906A 250 V 6A W 912A 250V 10A AC fuse Prevents excessive current flow W 906A 250V 3A W 912A 250V 5A
6. Blank panel user s space The space of 103 w x 63 h x 95 d mm is provided An optional expanding kit may be loaded in this space Equalizer security cover Prevents inadvertent changes of the equalizer controls set at proper level Key locked door Prevents tampering Front viewed with the front cover removed 17 18 19 20 21 22 8 AC power cord Connects to power source Speaker output terminals Connects to speakers Output terminals Select output impedance with this terminal Low cut switch Cuts off unnecessary low frequency Module input ports Accept PLUG IN MODULES which are optionally available Module selection is determined by application Bridging input output This terminal is used as a mixing bus Mixing is achieved when the similar terminal of another amplifier is connected to this terminal The output level taken from this terminal is independent of the all CONTROLS except INPUT VOLUME CONTROLS so that the terminal can also be used as recording output The input impedances of the equipment to be connected here should be more than 10 kQ Junction Box 23 Mute terminal With modules employing muting function which are optionally available the input signals fed to the modules are muted by short circuiting at this terminal Cord clamp
7. OUTPUT the acoustic effect and frequency D aia response characteristics may be altered In TRANS OUTPUT cut off FLAT unnecessary low frequency to obtain the best acoustic condition W 912A Change cable connection for required impedance according to the speaker used SPEAKER OOE OUTPUT 70V 25V 8Q COM N 420 elsleelefefe bild Insert shorting bar between 4 Q amp and OT IN 8Q or O 5 2 Q 25 V line or 41 Q 70 V line LOW CUT Place the LOW CUT SWITCH in CUT position e When connecting speakers to the 4 Q output UNBALANCED DIRECT OUTPUT connect as illustrated below OT 70V 25V 8Q COM IN 4Q elelejesjels SPEAKER OUTPUT UM Remove shorting bar Step 8 Input connections e This unit has six INPUT PORTS for plug in modules Select the desired modules for each application e Plug the modules into INPUT PORTS sliding them between the guide rails and secure each with two screws A CAUTION Modules should no be inserted or removed while the amplifier is turned on e When not all INPUT PORTS are occupied cover the vacant PORTS with back panels and secure them with screws e PLUG IN MODULES are provided in the following Balanced low impedance microphone preamp module with presettable low cut filter high cut filter and gain controls H 01 H 21 Balanced low impedance microphone preamp module with prese
8. RMS 120 W RMS Power Bandwidth 20 20 000 Hz 0 5 THD 20 20 000 Hz 0 5 THD 30 20 000 Hz 1 dB D T D T 30 15 000 Hz 1 dB T 30 20 000 Hz 1 dB 3 dB Total Harmonic Distortion 0 02 at 1 kHz rated output Inputs Six input ports Each port accepts any input module except T 01S Use T 018 only in port 5 or 6 One bridging input output Input Sensitivity Impedance Input ports 1 to 6 100 mV 10 kQ Bridging input output 100 mV 3 3 kQ Outputs T 8 Q 25 V and 70 V balanced D 4 Q unbalanced Output Regulation 1 kHz D Less than 0 5 dB no load to full load T Less than 1 0 dB no load to full load Signal to Noise Ratio Controls OFF 90 dB Band Pass 20 20 000 Hz Master volume Max 77 dB Equalizer IN 88 dB Compressor IN 84 dB Compression Attack time No greater than 2 milliseconds Compression range 20 dB Release time Adjustable 20 2 000 milliseconds Distortion Less than 1 Equalization 9 Band ISO One octave graphic equalizer Center frequencies 63 125 250 500 1000 2000 4000 8000 16000 Hz Equalization range 12 dB Filters High pass filter 180 Hz 12 dB octave Low pass filter 7 kHz 12 dB octave Controls 6 Input gain controls 1 Master gain control 1 Compression level control 9 Equalizer controls 1 Power ON OFF switch 1 Equalizer ON OFF switch 1 High pass filter ON OFF switch 1 Low pass filter ON OFF switch 1 Low cut switch 60 Hz 6 dB octave inside
9. Za OA VA OPERATING INSTRUCTIONS NEW 900 SERIES IN WALL MIXER POWER AMPLIFIER W 906A W 912A a SN 10020200000040000000000000000000100 000000000 COON 10000000000040 0OVOOOOOOOOO O00000 ONON C000 es 2 OG O OKK OKOGOGGOKGKKO KO GEnGKOKEkKkkKnenndgen ee zy TABLE OF CONTENTS 1 GENERAL DESCRIPTION 0 c eee 2 6 OPERATION 2 ness 8 2 FEATURES hisse nerdene 2 7 HOW TO USE VOLUME CONTROL COVER 9 3 NOMENCLATURE AND FUNCTIONS 8 OUTPUT EQ CHARACTERISTIC 10 Front E E E E E 3 9 BLOCK DIAGRAM Lunn 10 Front viewed with the front cover removed 4 10 SPECIFICATIONS 11 4 INSTALLATION AND CONNECTION 5 ACCOSSOMICS aasiisseesereesrrrrerrrrrrerrrenserrrnnnene 12 5 SERVICING 2 8 Please follow the instructions in this manual to obtain the optimum results from this unit We also recommend that you keep this manual handy for future reference TOA Corporation 1 GENERAL DESCRIPTION The TOA W 906A and W 912A Mixer Power Amplifiers control and mix up to six independent input signals plus two inputs with use of expanding kit The W 906A delivers up to 60 W of output power and the W 912A 120 W Optional accessory modules are available for use with the W 906A and W 912A to provide versatility for a wide range of operating applications Edg
10. del YA 910 as necessary 8 OUTPUT EQ CHARACTERISTIC 1 Module Input Ports 20dB V 100mV 10kQ 5 6 dB 12 10 8 6 4 20 50 100 200 500 1k 2k 5k 10k 20k Hz 9 BLOCK DIAGRAM 24V DC High pass filter Low pass filter iis 180Hz 12dB Oct 7kHz 12dB Oct OT Balanced Van N Transformer pod on on N 70V I I S i pool off off an lol Unbalanced I I i Compressor i Direct Output Io Equalizer Limiter Thermostat 105 C 11 40 1 I Out off one lt ey PG Be if power eooo I I In mp Output Fati Low cut Fuse Master I 60Hz 6dB Oct 1 Le Volume Control Bea Relay Speak i eal peaker p3 EQ COMP 3 Indicator Val eae pee ewes pe R ae RF r Equarizer Control Release Compressor ek 63Hz 16kHz Time Limiter DC Drift 9 Control 24V DC 20y PT lt Dmi Power Mute Bridging In Out Poter NN I Switch E ndicator 1 AC 120V 20dBV 3 3kHz AN No 60Hz i AC a i Y Fuse a ry lt 0 dBV 1 V approx 2 dBm Vcc 10 10 SPECIFICATIONS Type Wall mounting 6 channel mixer power amplifier Output Power 60 W
11. e connectors at the bottom of the front panel permit the selection of the TOA plug in modules The H 01 series H 02 series H 03 series H 21 and H 22 Microphone Preamplifiers the E 01 series and E 11 series Mag Phono Preamplifiers the X 01 series X 11 series and X 21 Auxiliary Preamplifiers for high level sources the B 01 series and B 11 series Bridging Transformers for bridging high impedance lines the L 01 series Line Matching Transformers for matching 600 Q lines 1 01 Paging Input for combining with TOA Intercom Systems EXES 1000 EXES 5000 and EX 16 T 01 series Line Outputs for matching 600 Q lines and the S 01 S 02 and S 03 Tone Signal Generators for generating attention getting signals and 1 kHz sine wave for testing within the total system Other features include a muting function Sources fed to particular input module accessories are muted by short circuiting at MUTE TERMINALS on the front To perform this function Module E 11 X 11 series or B 11 series is required Using any of the modules H 21 H 22 and X 21 permits the input signal level to be controlled remotely by means of an external potentiometer The W 906A and W 912A have a built in one octave graphic equalizer with 9 bands to tailor sound system frequency response to room acoustics reducing feed back tendencies and improving intelligibility A built in compressor circuit is provided to protect the output level from distortion as a result of excessive input and keeps it constan
12. el Since turing it fully clockwise far too much limits the output level set the switch at a maximum point that does not cause the peak indicator to light up Adjusting release time Compressor release time is set at 2 seconds on the amplifier supplied from the factory Adjust the release time if necessary by means of the release time controls at the rear of the amplifier Output Fuse Output 4 Clip _ e OFF be ie COMPRESSOR os CONTROL Rated Z e HALF ip T MAX Input Release time control MIN MAX VR303 Equalizer printed circuit board VR301 CN302 Each amplifier has an output fuse to protect the amplifier from short circuiting at the output or overloading Check the fuse when speakers connected do not sound even if the meter deflects normally If the fuse blew replace with the same type fuse after confirming the following points Step 1 Speaker cables are not short circuited or the load does not exceed the rating specified Step 2 Wiring is correctly done at the output terminal board 7 HOW TO USE VOLUME CONTROL COVER Step 1 After adjusting the input volume control remove its knob Step 2 Attach the supplied volume control cover to the chassis in place of the knob we amp oh T 2 Volume control cover YA 910 Input volume control cover knob Note The unit comes with 3 volume control covers as standard accessories Ask for the optional one mo
13. fier output impedance may be selected at the output terminals on the front panel Class 2 Wiring SPEAKER CORD may be used D Step 6 Fixing the amplifier Fix the amplifier to the back box with screws after connecting the power cable and the speaker cable Step 7 Selecting output impedance M4 x 10 mm Screw 3 pes Ne a Select appropriate output impedance that matches the speaker to be used Class 2 wiring may be used Since these outputs consist of 8 Q 25 V and 70 V via the output transformer matching transformer and direct output of 4 Q the connecting method differs in each case See the following diagram Note Impedances indicated below imply total speaker system load impedances e When connecting speakers to any one of the outputs of 8 Q 25 V or 70 V BALANCED TRANSFORMER OUTPUT connect as illustrated below W 906A Change cable connection for required impedance according to the speaker used fond ole SPEAKER 0 OUTPUT 70V 25V 8Q COM N 0400 elelefelejele bil Insert shorting bar between 4 Q amp and OT IN 8Q or O 10 4 Q 25 V line or 83 Q 70 V line Note In this case the LOW CUT SWITCH should be in CUT position The gine EP amplifier is characteristically flat even in the low frequency range Therefore in TRANS
14. o operation Adjustment of Volume Adjust the individual input and master volume controls to obtain appropriate output level When the peak indicator remains lit reduce the sound volume to turn it off If the system is operated with the peak indicator lighting it downgrades sound quality Adjusting graphic equalizer The one octave graphic equalizer tailors sound system frequency response to room acoustics reducing feed back tendencies and improving intelligibility Characteristic of this equalizer is as per below graph Adjust it to obtain the desired frequency response by actually hearing the sound or by using pink noise To make the adjustment place the EQ switch in the IN position If a control knob is moved toward the plus direction center frequency is boosted and if toward the minus direction it is cut Placing the EQ switch in the OUT position bypasses the equalizer circuit and makes frequency response flat Filter When the HIGH PASS FILTER switch is in the ON position low frequency is cut In this event low frequency below 180 Hz may be cut at a 12 dB OCTAVE rate When LOW PASS FILTER switch is in the ON position high frequency of 7 kHz or higher may be cut at a 12 dB OCTAVE rate To bypass the filter place the filter in the OFF position 8 Compressor If the COMPRESSOR CONTROL switch is set to OFF it bypasses the compressor circuit Turn it clockwise to activate the compressor and to adjust the limiting lev
15. t Compressor s threshold level can be adjusted The W 906A and W 912A Mixer Power Amplifiers have output terminals to match 4 or 8 Q speaker systems or speaker distribution system may be connected to the 25 or 70 V terminals User s blank space is provided for additional functions to be made by the customers The expanding kit optional may be loaded in this space when the number of input is increased Protection against tampering is assured by means of a key locked hinged door The W 906A and W 912A can be mounted in any four inch wall with of the BX 9F Flush Mounting Black Box On wall mounting is also possible with the BX 9S Surface Mounting Box 2 FEATURES e 6 channel mixer power amplifier e Expandable to 8 input e Output power 120 W for W 912A 60 W for W 906A e Wide frequency response 30 to 20 000 Hz 1dB e Low distortion and noise e Excellent output regulation e Built in one octave equalizer e Built in compressor e Self protection circuitry design e Separate output terminals 4 and 8 Q 25 and 70 V e Extra space for customizing e LED pilot light e LED peak indicator e Full range of plug in modules e Flush and surface mounting Front EC TIOOCOOOOOOC 0000000000000000 C0000000 KOOUUUHNUDOUOOKGKKGD 000000000000 O0OOCOOOOOOO L ad TOA 900 SERIES 3 NOMENCLATURE AND FUNCTIONS Equalizer Section 0 EQUAL ZER HIGH RASS LOW FASS our n oF Jon oF ON 63 125 250 500
16. ttable low cut filter and gain controls H 02 H 22 Unbalanced high impedance microphone preamp module with presettable low cut filter high cut filter and gain control H 03 Equalized mag phono preamp module with presettable gain controls E 01 E 11 Unbalanced high impedance auxiliary preamp module with presettable gain control X 01 X 11 X 21 Balanced 10 KQ bridging transformer module B 01 B 11 Balanced 600 Q line matching transformer module L 01 Balanced paging input module with presettable gain control and MUTE Delay l 01 Balanced 600 Q line output module with presettable gain control T 01 Signal tone generator module with presettable output level control 1 kHz sine wave Yelp and buzzer One tone chime and continuous one tone chime S 01 5 02 5 03 With H 21 H 22 and X 21 modules employing volume remote control functions connecting a potentiometer 10 kQ to the terminal of any of these modules permits the sound volume to be remotely controlled by means of the connected potentiometer E 11 X 11 and B 11 modules incorporate muting functions If a switch is connected to MUTE TERMINAL on the rear panel of the amplifier and closed these input signals can be muted T 01 is used to feed out mixed signals to external equipment T 01 should be inserted only in Input Port 5 or 6 See the supplied NEW 900 SERIES MODULES manual for details
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